Gilbert F. Gelfand, M.D.  is a board-certified rheumatologist and fellow of the American College of Physicians (FACP) and the American College of Rheumatology (FACR). He is a Clinical Professor of Medicine at the Keck School of Medicine of University of Southern California (USC). He has been caring for patients in Whittier area and throughout the Southeast Los Angeles area for more than 30 years.  Dr. Gelfand studied medicine at the Autonomous University of Barcelona in Spain. He completed his medical training in the U.S. at Maimonides Medical Center and Coney Island Hospital, both in Brooklyn, New York. His Rheumatology training was completed at the Long Island College Hospital with rotations through the Hospital for Special Surgery (Cornell) and Downstate Medical Center.  Dr. Gelfand is presently serving as a Chief of Rheumatology at Rancho Los Amigos Medical Center. This is a USC teaching hospital where he actively participates in the training and education of rheumatology fellows and orthopedic residents.  He speaks both English and Spanish, and enjoys the opportunity to use both languages with his patients. In his free time, he is also an avid hiker/mountaineer, runner, reader and enjoys spending time with his wife and two daughters.


Gilbert F. Gelfand, M.D. is a board-certified rheumatologist and fellow of the American College of Physicians (FACP) and the American College of Rheumatology (FACR). He is a Clinical Professor of Medicine at the Keck School of Medicine of University of Southern California (USC). He has been caring for patients in Whittier area and throughout the Southeast Los Angeles area for more than 30 years.

Dr. Gelfand studied medicine at the Autonomous University of Barcelona in Spain. He completed his medical training in the U.S. at Maimonides Medical Center and Coney Island Hospital, both in Brooklyn, New York. His Rheumatology training was completed at the Long Island College Hospital with rotations through the Hospital for Special Surgery (Cornell) and Downstate Medical Center.

Dr. Gelfand is presently serving as a Chief of Rheumatology at Rancho Los Amigos Medical Center. This is a USC teaching hospital where he actively participates in the training and education of rheumatology fellows and orthopedic residents.

He speaks both English and Spanish, and enjoys the opportunity to use both languages with his patients. In his free time, he is also an avid hiker/mountaineer, runner, reader and enjoys spending time with his wife and two daughters.


    Tien-I Karleen Su, M.D.  is a board-certified rheumatologist and a member of American College of Rheumatology and the Alpha Omega Alpha Medical Honor Society. She is an Adjunct Clinical Assistant Professor of Medicine at the Keck School of Medicine of University of Southern California (USC). She has been treating patients in the Whittier area and throughout Southeast Los Angeles for more than seven years.  Dr. Su studied medicine at the University of California, Los Angeles (UCLA) and completed her rheumatology fellowship at the Keck School of Medicine of University of Southern California (USC).  Dr. Su enjoys traveling, visiting museums, and photography (some of her photographs from her travels are featured here on our website). She speaks English, Spanish, and Mandarin.

Tien-I Karleen Su, M.D. is a board-certified rheumatologist and a member of American College of Rheumatology and the Alpha Omega Alpha Medical Honor Society. She is an Adjunct Clinical Assistant Professor of Medicine at the Keck School of Medicine of University of Southern California (USC). She has been treating patients in the Whittier area and throughout Southeast Los Angeles for more than seven years.

Dr. Su studied medicine at the University of California, Los Angeles (UCLA) and completed her rheumatology fellowship at the Keck School of Medicine of University of Southern California (USC).

Dr. Su enjoys traveling, visiting museums, and photography (some of her photographs from her travels are featured here on our website). She speaks English, Spanish, and Mandarin.


    Ericsson Trieu, PA-C  is a board-certified physician assistant. He graduated from UCLA with a bachelor's degree in physiologic science. He then worked as an EMT on an ambulance in both Orange and LA counties for 2 ½ years. He started his physician assistant training in Nevada in 2013 and relocated back to southern California in 2017.  He initially practiced in primary care where he learned the importance of providing comprehensive care to patients and became well versed in patient education. He brought these qualities to his current position at Amicus Arthritis where patients have described him as compassionate and detail-oriented. His hobbies include traveling, photography, trying out new foods, basketball, and spending time with his family and fiancé. He speaks English, Cantonese, and Spanish. We are delighted that Mr. Trieu has joined Amicus Arthritis to provide quality care to all of our rheumatology patients!

Ericsson Trieu, PA-C is a board-certified physician assistant. He graduated from UCLA with a bachelor's degree in physiologic science. He then worked as an EMT on an ambulance in both Orange and LA counties for 2 ½ years. He started his physician assistant training in Nevada in 2013 and relocated back to southern California in 2017.

He initially practiced in primary care where he learned the importance of providing comprehensive care to patients and became well versed in patient education. He brought these qualities to his current position at Amicus Arthritis where patients have described him as compassionate and detail-oriented. His hobbies include traveling, photography, trying out new foods, basketball, and spending time with his family and fiancé. He speaks English, Cantonese, and Spanish. We are delighted that Mr. Trieu has joined Amicus Arthritis to provide quality care to all of our rheumatology patients!